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Re: Is there a Gnu Radio block to compute the power of a signal?

From: Marcus Müller
Subject: Re: Is there a Gnu Radio block to compute the power of a signal?
Date: Thu, 18 Nov 2021 13:37:08 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0

That's almost certainly not an answer to the question you're posing, namely "How do I measure the power of a specific class of signals". A function probe is just a method of getting some data out of a flowgraph, and it's almost never the appropriate solution (function probes are really more for debugging, or very sporadically/randomly updated GUIs and such, not for signal processing).

First of all, it's important to note that basically none of the SDRs you'd attach to GNU Radio come calibrated by default – so the numbers you see in GNU Radio are only proportional to some amplitude of electrical field. So, digital powers are only proportional to the powers on the air, but can easily be calculated taking the squared magnitude of your complex samples.

Best regards,

On 18.11.21 11:45, Rachida SAROUI wrote:
Thank you very much!

Le jeu. 18 nov. 2021 à 11:40, Van-Dung PHAM <dungdkt27@gmail.com <mailto:dungdkt27@gmail.com>> a écrit :

    Hi, you can use the Function Probe in GNU Radio to measure the Power in dBm

    Vào Th 5, 18 thg 11, 2021 vào lúc 11:23 Rachida SAROUI 
    <mailto:rachidasaroui@gmail.com>> đã viết:

        Hello everyone,

        I'm looking for a gnuradio block or a method to determine the power of 
a received
        LORA signal from an arduino. Can anyone help me please?

        Thank you

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